Tennekes 2010
Henk A.Tennekes 2010: "The significance of the Druckrey–Küpfmüller
equation for risk assessment — The toxicity of neonicotinoid
insecticides to arthropods is reinforced by exposure time".

More pesticide studies are summarised in a report by Buglife, and some
can be searched for on the internet by googling the references. The
document can be a little slow to download, but you may access it
here.